import pandas as pd

data = {
    "date": ["2020-01-01", "2020/2/02", "20010512"],
    "name": ["sprint", "good_day", "bad_day"],
}
df = pd.DataFrame(data)
df["date"] = pd.to_datetime(df["date"], format="mixed")
print(df)
"""
        date      name
0 2020-01-01    sprint
1 2020-02-02  good_day
2 2001-05-12   bad_day
"""
